Re: [Help-gnucap] howto use different phase and frequency in sources for transient analysis?

[Rubén Gómez Antolí]

Hello al:

al davis escribió:
> On Saturday 17 October 2009, Rubén Gómez Antolí wrote:
> > I need to specify different phases in sources in this way:
> >
> > I1 phase=-10 freq=60
> > I2 phase=150 freq=180
> > I3 phase=-56 freq=300
> >
> > SIN sources not admit phase option.
>
> > I try with generator function: 
> > .gen ampl=10 phase=-10 freq=60
> > I1 n1 n2 generator(1)
> > .gen ampl=15 phase=150 freq=180
> > I1 n2 n3 generator(2)
> > etc.
> >
> > but I see that generator don't work in this way.
>
> You are correct .. It don't work in this way.
>  
> > I look for in the net without sucess. I see that in AC
> >  analysis is possible, but I need to do in transient
> >  analysis.
> >
> > There are anyway to do this?
>
> What is the meaning of phase in transient analysis, when you 
> have different frequencies?  The phase relationship between them 
> is always changing.  I suppose it could be the phase at time=0, 
> and translate to delay.

It's an class exercise based on a example from Power Electronics's Mohan 
book.

I'm checking the harmonic current influence in circuit.

In a previous Fourier analisys I get phase and frequency of currents for 
1, 3 and 5 harmonic:

# i(LS)     --------- actual ---------  -------- relative --------
#freq       value        dB      phase  value        dB      phase
 0.         0.0063273  -43.98   90.000  405.58E-6  -67.84  100.271
 60.        15.601      23.86  -10.271  1.           0.00   -0.000
 120.       0.011073   -39.11  -92.415  709.79E-6  -62.98  -82.144
 180.       11.821      21.45  148.226  0.75772     -2.41  158.497
 240.       0.0071613  -42.90   85.933  459.04E-6  -66.76   96.205
 300.       6.3621      16.07  -57.484  0.40781     -7.79  -47.213

Then, I put three current sources in the original circuit, which was 
thought to be used in Pspice format, for this reason this phase value. :^(

> What you do have is "delay".  You can get what you want with SIN 
> source, specifying a delay in seconds.
>
> try delay={(phase/360)/frequency}

I try with it:

1· I obtained the "correct" waves for I1, I3 and I5.

2· I can't obtain the "correct" wave for I(LS).

I think there is something wrong in circuit, but I'm not sure. Here are 
the circuit:


DBRECT1A.CIR
* Single-Phase, Diode-Bridge Rectifier
* Fourier components of i(LS) are included as I1, I2 and I3.
* Power Electronics: Simulation, Analysis & Education.....by N. Mohan.
.SUBCKT DIODE_WITH_SNUB 101 103

DX      101 102   POWER_DIODE
RSNUB   102 103   1000.0
CSNUB   103 101   0.01uF
.MODEL  POWER_DIODE  D( RS=0.01, CJO=100pF )

.ENDS DIODE_WITH_SNUB

.PARAM  FASE1 = -10.04
.PARAM  FASE2 =  148.9
.PARAM  FASE3 = -56.39
.PARAM   FREQ0 =  60.0Hz
.PARAM   FREQ1 =  60.0Hz
.PARAM   FREQ2 = 180.0Hz
.PARAM   FREQ3 = 300.0Hz
.PARAM  RETRASO1={(FASE1/360)/FREQ1}
.PARAM  RETRASO2={(FASE2/360)/FREQ2}
.PARAM  RETRASO3={(FASE3/360)/FREQ3}

LS       1  2  1mH
RS       2  3  1m

LD       4  5  1uH
RLOAD    5  6  20.0
CD       5  6  1000uF IC=160V

XD1      3  4  DIODE_WITH_SNUB
XD3      0  4  DIODE_WITH_SNUB
XD2      6  0  DIODE_WITH_SNUB
XD4      6  3  DIODE_WITH_SNUB

VS       1  0  SIN(0 170V {FREQ0} 0 0)

I1       7  0  SIN(0 15.35A {FREQ1}  {RETRASO1} 0)
I3       8  0  SIN(0 11.74A {FREQ2}  {RETRASO2} 0)
I5       9  0  SIN(0 6.482A {FREQ3}  {RETRASO3} 0)

R1       7  0  1.0
R3       8  0  1.0
R5       9  0  1.0

.END

What do you think about this?

Regards.

Salud y Revolución.

Lobo.

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